Combination bit and underreamer



Nov. 4 3924 S. HANCOCK COMBINATION BIT AND UNDERREAMER Filed April 25Pas ed-Na: 4,1924.

* To whom it may c oncehz 1 rumcocx, or snrnnrn, OK AH MA.

cominm'rron 'm'r AND nnnnnamm Apptication m April 25, 1924. Serial in.708,957.

.Be it known thatl, Scorrrllknooon, a'

citizen of the United States, residing at ."Shldlelgin the'county ofOsage and State of Oklahoma, have invented certain new and usefulImprovements in a: Combination Bit and' Underreamer', of which thefollowing is a specification.-

This. invention relates to .ajcombination bit and underreamer, and itconsists in the novel features hereinafter described and claimed.

objectof the-invention is to provide a tool including a drill bit and anunder reamer, and adapted to. be used drilling clean out; the ;wel l,both Operations taking wells, and which will drill and underream'or 1 a.further object-of th esears it provide means ,for resiliently i1v andslidably holding thereamer,-bit:upon the shank of the drill bit,so,thatthey-mayoperate in the earth below the lower edgeof the wellcas-' ing, and .cutthe earth toallowspace for the lowering of .thecasing in'the hole.

includes a. drill bit provided at its side with longitudinally disposedrecesses, the said recesses having in their opposite side walls groovesadapted to receive flanges, which are provided upon the reamer bit,'.andwhereby the said reamer bits may move longitudimay encounter the'loweredge of the casin vand thus they are-held at iixed points whi e thedrill bit continues in its upward movement. At such time, the springsare contracted longitudinally and. the sections of the connectmgmeansmay move longitudinally with relation to each other. When the drill bitdescends, the said springs expand longitudinally and the sections of theconnecting means move with relation to each,

other -correspondin ly' until such time as the reamer bits arrlve at theends ofthe .With'theseobjects in view, the structure groove where all ofthe gether. v In'the accompanying drawing:

Figure 1 1s a side elevation of the combinaparts descend; to-

tion drill bit and'underreamer, with 'parts' broken away,- and partsshown in section.

Figure 2 is a side elevation of. the combined bit and under reamer,viewing the' same at the side thereof, which is disposed at a rightangle to the'sideshown in elevation,

in Figure 1. p

Figure 3 is a perspective view of one of the'reamer bits detached.

The combination bit and underreamer includes a drill bit 1, having ashank 2,'and which may be connected with a drill rod (not 1 shown), ina'usual manner. The shank 2 is providedat its side with one or morelongitudinally disposed recesses 3, having at the opposite side wallslongitudinallydisposed grooves 4. At the upper ends, the recesses 3 areenlarged, as at 5, and shoulders Gare provided at the lowerends of. thesaid enlargements. At the upper ends, the recesses 3 are provided withsockets .7, which are formed in the upper portion of the shank 2, and asbest indicated in Figure 2 of the drawings.

The device also includes one or more reamer bits 8, which are-provided,at their opposite sides, with flanges 9, adapted to be slidably receivedin the grooves 4:. Recesses 10 are formed in the upper ends of the bits8, and are disposed transversely of the bit, said recesses beingprovided at their lower portions, with diametric enlargements 11. Therecesses 10 and the enlargements 11 thereof are disposed at acute anglesto the inner faces of the bits 8, as best indicated in Figure 1 of thedrawin s. The device also includes bars 12, provi ed at their upper endswith head portions 13, which are pivotally received in the sockets 7.The lower portions of the bars 12 are slotted longitudlnally as at 14:.The bars 12 are normally received in the upper ortions of the recesses3.. Bars 15 are provi ed at their u per portions with longitudinallydispose recesses 16, and the bars 12 and 15 are llnked together at theirrecessed portions, as the end parts of the respective bars, pass throughthe slots of the co-acting bar. Pins 17 are carried at y the upperportions of the bars 15, and coil springs bear at their upper endsagamst the springs 17,. and at their lower ends against theshoulders 6,provided at the opposite side walls of the recesses 3. The bars areprovided at their lowerends with heads 19, which are slidably receivedin the enlargements 11, ofthe grooves 10, of the reamer-bits 8.

Th e recesses 3 are deeper at their lower ends, as at 20, than at theirupper portions, in order that the reamer bit 8 maybe moved down, intothe lower portion of the said recesses, and into the deeper partthereof. When this is done, the bit 8 may be moved transversel of theshank 2, whereby the head 19 02. the bar 15, may be moved out of theouter end of'the recesses 10 'of the said bit. By'reversing thisoperation,'.the bars may be connected with the bit.

. As the drill bit 1 is reciprocated, during the operation of drillingthe well in the earth, the bit 8 will work in the earth, under the loweredge of the well casing, and cut the earth so that the casing may bereadily lowered in the well. During the upward movement of the shank 2,should the upper portions of the bit 8 strike the lower edge of the.well casing, the bit 8 will come to a state of rest, while the shank 2cmtinnes its upward movement. Thus, the springs 18 are compressedlongitudinally, and the bars 15; move longitudinally with relation tothe bars 12. When the shank 2' descends, the spring 18expands, wherebythe bars 15-move upwardly along the descending bars 12, until theflanges 9 of the bit 8 encounter the upper ends of the grooves 4, whenall of the parts descend in the well together.

Having described my inventiomiwhat is claimed is: I

1. A combined drill bit and underreamer comprising a shank provided atits side with a longitudinally disposed recess having grooves in itsopposite side walls, a reamer bit having at its opposite sides flanges,which are slidably received in said grooves, a longitudinally extensibleelement consisting of overlapping bar sections connected at one endterlinked with each other, and

with the .shank and at its other end with the reamer bit, and springmeans engageable with the shank and adapted to normally hold the flangesof the reamer bit against the endwalls of the grooves in the shanks.

2. A combined drill bit and'underreamer comprising a shank having at itsside a longitudinally disposed recess provided at its 0 posite sidewalls with longitudinally disposed grooves, a reamer bit havingoutstandmg flanges, which are slidably received in said grooves, saidreamer bit being provided at its upper ends with a transversely disposedrecem, which is diametrically enlarged at the inner portion of the bit,overlapping barsections, one of the said bar sections having a headwhich is pivotally mounted upon the shank, and the other'section havinga head which is slidably received in the recess .of the reamer bit,saidbar sections being ina sprin bearing against the shank, and one of te bar sections, and serving to hold the flanges of the reamer bitagainst the end of the groove in the shank.

3. A combined drill bit and underreamer comprising a shank provided atits side with a longitudinally disposed recess having grooves at itsopposite "sidewalls, a reamer bit provided at its opposite sides withflanges, which are slidably received in said grooves, the said reamerbit being provided at-its upper end with a transversely disposed recess,

overlapping bar sections interlinked with each other, one of the saidbar sections being provided at its upper end with a head, which ispivotally connected with the shank, and

SCOTTY HANCOCK.

